Kröl version 0.04 ! Added alarms and secret rooms

Gameplay changes : 

•  the player's movement can be stopped by a right click 
•  torches now have a limited duration, and are consumed each turn 
•  traps can now be triggered by npcs 
•  you can whistle to attract npcs
• items are now dropped in front of the player, and can trigger a trap (the item being destroyed) 
•  traps can now be generated in front of an entrance
•  added crumbly walls that can be destroyed with a new "Pickaxe" card; some cells and entire rooms can only be accessed by destroying these walls 
•  new trap type: alarm that attracts npcs from adjacent rooms 

 Interface changes:

•  icons for skills have been added to the character sheet, displaying the corresponding card on mouse-over 
•  added a 'Whistle' button 

 Graphic changes: 

•  harmonised the appearance of the map's perimeter walls
• added a shadow under the player and the npcs during movement 

+ various minor fixes and improvements